Is a simple script to generate a deploy key securely in place on an external drive using any operating system.
Usage is:
python3 gendeploykey.py private_key_filename_id_rsa
The public key will be stored as whatever_filename.pub and also printed to
console so it can be added as a deploy key on GitHub (or wherever).
By default, gendeploykey will refuse to generate a private key on internal
storage. A USB stick or MicroSD card must be used. This check can be
disabled with --no-check-path but it's recommended you not do this unless the script is not detecting your external disk correctly.